高分子太陽能電池 (Polymer Solar Cell)
Our research in polymer solar cell (PSC) is focused on the bulk heterojunction in the active layer. As shown in the figure above, the active layer is composed of conjugated polymer as donor and fullerene derivative as acceptor. The mechanism of the PSC is described below: (1) the polymer absorbs the sunlight to generate excitons, (2) exciton dissociation occurs at donor/acceptor interface to generate free charges (electron and hole), and then (3) the generated charges transport toward the electrodes. An ideal active layer is able to allow forming separated charge pathways for electrons and holes to transport, so that the possibility of charge recombination is reduced to minimum. The research directions of our lab are focused on (1) new material design (for example, PTB7-Th, which is now availabe in the market); and (2) the interface modification between active layer and electrodes. Now, our PSC gives the power conversion efficiency (PCE) 10.31% in single junction polymer solar cells in 2014, which is the first time breaking the 10% target set by the Department of Energy, USA. We are now working on a single PSC with the target 12%.
Selected Publications
